The estimable Wondermark site has a series of posts up on the process used to make their hand-printed 2010 calendar, including some tips on screen printing: Part 1, Part 2, Part 3, Part 4, Part 5

What I really want to highlight, though, is this statement from David Malki:

Whether you buy a calendar or not, whether this has inspired you to make anything creative of your own or not, whether you’re even the least bit interested in this process or not, I hope you take one key thing away from this entire, long-winded story. I’ll put it on its own line and bold it so you’re sure not to miss it:

You can make something from nothing.

Let me repeat that. You can make something from nothing. The Wondermark Calendar is not a model kit that we assembled from directions. It’s not a box of LEGO® brand interlocking building blocks that we dumped onto the floor and then very precisely made into a spaceship. The LEGO® brand interlocking building blocks that we used were paper and ink. Any meaning that they have been given is meaning that we have fabricated.

I think that’s an excellent sentiment which all crafters should take to heart. Don’t be afraid to branch out from premade kits and make something that’s entirely your own. It might take some work, but it will be wonderful.