My friend and I are trying to make t-shirt designs on my computer. Anyone know any free design software?

We’re trying to come up with shirt designs from scratch and we don’t know any good software programs for free. Please let me know if anybody knows anything.
Oh, and my computer is a mac.

Paint?

Oh wait, you’re a mac. Sorry.

My Design On T-Shirt

Art Explosion T-Shirt Factory Deluxe 3.0 $29.99 Art Explosion T-Shirt Factory Deluxe 3.0 is the fast and easy way to create one-of-a-kind custom T-shirts and apparel. Whether you re looking to support a function of your club or organization promote your business or create a unique gift for family and friends T-Shirt Factory Deluxe has everything you need to turn out spectacular projects. With thousands of ready-made designs and graphics it s no…

Brink Special Edition (PC DVD) Includes special bonus Doom Pack and Spec Ops Pack $19.99 This game contains installation codes. Due to this, this game cannot be returned once the plastic wrap has been removed. Brink Special Edition on PC Includes: * Brink game * In-game DOOM pack: Bulpdaun SMG skins, Cacodemon body tattoo, two DOOM t-shirts, two DOOM caps * In-game Spec Ops pack: Hockler machine pistol, Sloani mask, greeneye scope, dogtag tattoo Brink is an immersive shooter that …

Publisher’s Paradise T-Shirt Design Kit $5.90 …

Style Lab: Fashion Design $7.71 UbiSoft Style Lab Fashion Design 16615 Nintendo DS/DSi Games…