practice pieces for sewing machines

[Jazznow]

Hi everybody, 

Im currently thinking About Little Projects (20-30 minutes completly) to practice my sewing skills. I hate just sewing straight and curved lines on a patch of leather. I want to make something. 
Maybe im not the only one and we can collect and share Ideas. Important: add leather thickness, so we can see, if ist suitable for our machines (for example: i have a pfaff 901 post machine, it will sew 2 or Maybe 3mm of softer leather but not vegtan)

what i imagine is a Format like that: 

What: Little Coin Purse with key ring
leather thickness: 1,5mm
Description: a triangular coin purse with folded edges and a Strip of leather at the Bottom to install a key ring
Pics/Pattern: will add later