“Jabba the Snail” sticker
This somewhat bizarre image is another sticker from RedBubble.com. Like the others, it’s available as a T-shirt as well. The Jabba part of this image looked familiar to me, and after some searching I found the original image on this Deviantart page (and I left a comment about this for the original artist). It looks like the person who made the sticker really just added the snail shell and eyes on stalks to an image that someone else made. The more I think about it, the less I like the idea of taking someone’s work and tweaking it slightly to create a new design like this. It’s seems lazy, and borderline plagiaristic (I don’t think it really qualifies as parody since they aren’t parodying the art itself, but rather the subject that the art portrays, if that makes sense). Still, interesting.
Mighty Jabba's Collection 
Yeah, you know, when you really start to think about it, there can be a lot of difficulty in trying to define exactly what’s acceptable for building onto an existing work. I’m highly in favor of fair use and all that, but this is just clearly wrong to me, even though explaining precisely why might not be so easy.
Kudos to you for doing a good deed.