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unconsumption:

5 biodegradable seed-starting planter-pots to DIY
Like many of us, the gardening plans of Michele Pacey (mentioned previously here and here) include growing plants from seed.
In a recent blog post, Michele describes her seed-starting setup: seeds planted in biodegradable newspaper “pots,” which are placed indoors on foam meat trays while the seeds germinate.  
After seedlings have sprouted, the plants — pots and all — can be planted in soil.
To make your own biodegradable seed-starters:
Roll newspaper pieces around a jar and close the ends, as Michele shows in this short video, or roll pieces of newspaper around something like this.
Fold newspaper pages, origami-like, into pots. For folding tutorial, see the For Greenies blog.

Cut pieces of paper towel or toilet paper tubes, adding four slits on one end, then fold end pieces together to form a closed bottom. (Photo via girlgearstudio.) Ends also could be left open, as pictured in this earlier Unconsumption post.

Use eggshells, as mentioned here (with description for blowing out eggs).
 
Use citrus peels. (Found here.)

Another idea: Create mini-greenhouses from cut plastic bottles. Simply place bottle tops over plants. (Found on Poppytalk.)

What household waste do you use for starting seeds?