Well...not really.  What happened is that I keep taming different turtle skins and after a while, something about them just starts to bug me.  My first Sheldon was Gamooh-ra (probably misspelled that) from BFD.  He's the reddish-brown turtle with the "black" shell.  That is, til I got him out in normal daylight.  The "black" shell seemed instead this dingy dusty color, like year-old soot left in the bottom of a fireplace.  So, I released him and picked up a turtle from Dustwallow Marsh.  These are the gray ones with the green shell and purple highlights.  I really liked this new Sheldon for a while, til just recently when I picked up some gear upgrades.  I liked the gray skin, I liked the purple eyes and highlights, but again...it was that dang shell that bothered me.  It wasn't green like it looked in pictures, it's this grayish, washed-out green, reminiscient of a sock worn too many times.  Sooo, released Sheldon Jr. out into the wild and last night I picked up a green turtle from the rivers of Hillsbrad Foothills.  I think finally I may have found my final incarnation (is that the right word?  

 ) of Sheldon.  His green flesh matches my loverly green hair, and his golden shell doesn't seem to look as washed-out and dingy as the other turtles so far.
So, I was wondering, has anyone else done this?; tamed a certain pet skin, then decide you don't like it and tame another?  I've done this three times now with Sheldon, and by that third time last night felt a bit silly or nitpicky.  I guess I just like a pet whose color doesn't clash with my own.   
 
Edit: that reminds me, I gotta update my avatar AGAIN.