I do Turning Twenty for all my guys. It's easy and they like the look of larger pieces.

Log cabin, Bow Tie, any star pattern

disappearing 9 patch (D9P)

rail fence

have fun

How about something like this:

http://www.quiltingboard.com/t-48529-1.htm

She did a tutorial on this also, let me see if I can find that link....

Okay, here's the tutorial:

http://www.quiltingboard.com/t-49878-1.htm

I really like this, and could be done nicely with your flannel fabrics.