Fabric markers are an easy way to add a clean and bold pop of color to tea towels, pillow cases, plain tees, curtains, tablecloths, runners, etc. It's best to use one color per project and it looks really cool if the design is graphic and geometric! You could even pen a pattern on paper and lay your fabric over it to trace a design if you're no good at freehanding (guilty). A lightbox might be useful!
BTW I'm diggin the yellow! :)