Discovered via
goss, this looks fun:
Monthly Art-A-Day (or sketch-a-day), an artistic advent-calendar-style project of
darthneko's which they are kindly making available to everyone by sharing the templates. The link explains how it works, and
here is the February template (from the Deviantart page, if you click "download" instead of saving the image you'll get a higher quality one - at least that's what I found).
I made a blueline version for myself and
darthneko gave me permission to share it, so here's a mini preview and if you click on it, you'll get the full-sized one, which you can download:

Basically you print it out, fill in the boxes day by day according to their numbers (so you don't just start at the top and move to the right, you'll be jumping around), and have a finished art piece at the end. I strongly suspect I am going to end up with a weird-looking inked mess, but I'm looking forward to trying it! :D You can see
a very lovely finished example at
darthneko's journal.