There is a website called plaidmaker.com, where you put in colours and fiddle around with numbers of threads and it shows you what the plaid would look like! Isn't that cool? And quite addictive.
I got a weaving book for christmas which has tricky lace weaves and other different stitches you can do even with just a rigid heddle like mine, so I am experimenting with that. Most of it is ridiculously time-consuming of course, but interesting!