Other options for homemade seed pots include egg shells, soda bottles, and empty gift wrap tubes. More info at Mr. Brown Thumb.
Make a seed starting calendar.
I like the idea of having a card file for the seed packets, to determine when to plant.
Build a garden bench.
Make a tool caddy from old jeans.
Artistic garden projects, including concrete leaves, faux painted pots, etc.
Repurpose your old seed catalogs.
Make homemade paper you can plant.