When I said add-on, you can replace it with freebie or whatever.  My points stand. 

 

Ideas:

A popular product that a lot of people would be able to use

Something that you think has a good mesh but a bad texture/shader

2d textures that you think would need a good shader to look right

 

I'll add these two things as well:

1.  Something you'd think would be fun/challenging to work with

2. Create your own art style and pick an item that would look good with that style

 

 

I could just pick a random thing from my runtime, but I don't think that'd be productive.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)