>Any tips on warping without a warping board?
yes! it's a little hard to explain, so i found you some directions: http://reviews.ebay.com/Warp-a-rigid-heddle-loom-the-easy-way_W0QQugidZ10000000001572825?ssPageName=BUYGD:CAT:-1:LISTINGS:2
basically, you set up a warping peg and put your loom as far away from the peg as you want the warp to be. then, run a continuous thread between your back beam/back apron rod/whatever it is bekas have and the peg, going through each slot in the heddle.
the linked directions are much clearer, i promise.
btw: i like your colours a lot! that's a very cute scarf, and i love that i can see your progress.