During the 1960's, when B&W cartoons were beginning to have little or no commercial value (or so they think), Warner Brothers and NTA decided to commission Fred Ladd's company Color Systems to redraw their respective B&W cartoons (Porky Pig and Betty Boop) in color. The results may have been impressive at that time, but nowadays (especially in the computer-colourising age which can give much better results in colourising cartoons) one can be appalled by the poor technical quality in the redrawn animation (not every frame is traced, momentary missing limbs etc.), psychedelic color scheme, and poor film stock.
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It goes like this...
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...into this!
Of course, we all moan about these redrawns, and we hardcore animation fans prefer to see these cartoons as originally intended. But the sad truth is, these redrawns still kept the spirit of the originals in the public consciousness, and has enabled many fans to seek out the originals, resulting in a big demand to see them on DVD and other media. You could say that the redrawing process was a necessary evil at that time.
There were other companies that commissioned redrawns later on. Turner, in 1986, invited Entecolor Technologies (formerly Color Systems) to redraw their B&W Popeye and Merrie Melodies cartoons, which was a rather strange decision as they were starting to colorize their feature films using a computer process. While the technical quality and color palette was somewhat better than the redrawn Porky's and Betty's, plenty of mistakes were still made.
But perhaps the worst-looking redrawns of them all were commissioned by Radio & Television Packagers (who I shall refer to as R&TVP). They gave Color Systems a batch of (presumably) home-movie prints of (mostly) public-domain cartoons during the early 70's. Unfortunately, what R&TVP didn't know is that many of the cartoons do exist in their original colour! Also, they failed to realize that some of them were silent versions of sound cartoons (they will later add corny music to those redrawns). On one cartoon, they had the ending redrawn to something completely different!!! The result is a series of redrawns that are sooooooooo bad, they are actually quite entertaining in their own unique way.
Here is a complete list of the 43 R&TVP cartoons, as compiled by Richard Jebe and Pietro Shakarian:

"Toy Shop" – "We're in the Money" (1933), WB
"Ain't Nature Grand?" – 1931 WB of the same name
"Barnyard Frolic" – "Moonlight for Two" (1931), WB
"Bosko's Woodland Daze" – 1932 WB of the same name
"Country Boy Rabbit" – "The Country Boy" (1935), WB (originally color)
"Magazine Rack" – "I Like Mountain Music" (1933), WB
"Off To The Races" – "Ups 'N Downs" (1931), WB
"On Duty" – "One More Time" (1931), WB
"Accidents Won't Happen" – (1925) Mutt and Jeff of the same name
"The Invisible Revenge" – (1925) Mutt and Jeff of the same name
"Where Am I?" – (1925) Mutt and Jeff of the same name
"Mixing In Mexico" – (1925) Mutt and Jeff of the same name
"Oceans Of Trouble" – (1925) Mutt and Jeff of the same name
"Soda Jerks" – (1925) Mutt and Jeff of the same name
"When Hell Froze Over" – (1926) Mutt and Jeff of the same name
"The Weird Adventures Of Mutt And Jeff And Bugoff" – "Slick Sleuths" (1926), Mutt and Jeff
"Dog Missing" – "Dog Gone" (1926), Mutt and Jeff
"Egyptian Daze" – "Mummy O' Mine" (1926), Mutt and Jeff
"The Mail Pilot" – (1927) Aesop's Film Fable of the same name
"The Under Dog" – (1929) Aesop's Film Fable of the same name
"Tuning In" – (1929) Van Beuren of the same name
"Love Bugs" – "Fly Hi" (1931), Van Beuren
"Art For Art's Sake" – (1934) Van Beuren of the same name
"The Villian Pursues Her" – "Sinister Stuff" (1934), Van Beuren
"Chinese Lanterns" – "Japanese Lanterns" (1935), Van Beuren (originally color)
"Batter Up" – "Play Ball" (1932), Terrytoons
"Spring Cleaning" – "Kiko's Cleaning Day" (1937), Terrytoons
"The Dancing Bear" – 1937 Terrytoon on the same name
"Lumberjack" - "The Saw Mill Mystery" (1937), Terrytoons
"Music And Charm" - "The Villain Still Pursued Her" (1937), Terrytoons
"The Inventor" – "Felix Turns the Tide" (1922), Sullivan
"Sunken Treasure" – "Felix Braves the Briny" (1926), Sullivan
"Misses His Swiss" – "Felix Misses His Swiss" (1926), Sullivan
"Scoots Through Scotland" – "Felix Scoots Through Scotland" (1926), Sullivan
"Mr. Do–All" – "Jack From All Trades" (1927), Sullivan
"Jack Frost" – (1934) Iwerks of the same name (originally color)
"Puss in Boots" – (1934) Iwerks of the same name (originally color)
"The Steadfast Tin Soldier" – "The Brave Tin Soldier" (1934), Iwerks (originally color)
"Cinderella" - "Once Upon a Time" (circa 1936), Audio Productions
"Big City" – (1947) UK Bubbles and Squeek cartoon of the same name
Grampus & Scrappy” - "The Big Game" (1928), Aesop's Fable

Unidentified:
"They Shall Not Pass" – Mutt and Jeff
"Double Performance" - Unknown

In these series of posts (yes, I'll be making some R&TVP articles, so be warned - lol ;3),I shall be posting specially-selected redrawns, along (where possible) with their originals for comparison.
And to start off with, here's a redrawn version of Felix Misses His Swiss, starring the title character as a burgundy-colored cat!. Unfortunately, I don't have the original to upload, but according to David Gerstein, the final scenes were missing from the original source print, so you will see a fake (clover-shaped???) iris-out before it reaches a satisfying conclusion.

Did the re-tracers really believe that Felix was grabbing his gonads at the beginning of the cartoon (lol)?
For this series, as these will mostly be public-domain cartoons, I've decided to abandon imposing a time-limit on their availability. ^-^