I like to design models, preferably vase mode (because they print so quick) or print-in-place, mostly quite minimalistic (but functional) - that's just my style. I tend to design containers/boxes of various kinds.
I design everything in OpenSCAD (I'm a programmer at heart), so most designs are highly parametric. If you need a different size of a model that can't easily be scaled, write a comment, and there's a good chance I can add a variant in that size.