I think its great you want to grow indoor plants and even greater that you are looking out for the well being of your cats. I also have two cats and a house full of plants. I am not certain about growing house plants from SEED, but the following websites might be helpful. If nothing else they do tell you what plants are safe for your cats.
http://www.lapcat.co.uk/healthandbehaviour/cats-houseplants/cat_friendly_houseplants.html
http://www.veterinarypartner.com/Content.plx?P=A&A=1315&S=2
http://www.ehow.com/how_15265_choose-pet-friendly.html
http://www.howtodothings.com/pets-and-animals/a4334-how-to-stop-your-cat-from-eating-houseplants.html
Hope this helps.
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