I scanned my signature at high resolution from blank white paper, cleaned it up a little with Paint.net, and made the white areas transparent. Pasting that into

I scanned my signature at high resolution from blank white paper, cleaned it up a little with Paint.net, and made the white areas transparent. Pasting that into documents has saved me a lot of hassle. Legally I'm pretty sure you could also just draw an X on there and you'd be fine.