Design of pictograms

I am in need of approx. 500 pictograms like symbol for washing laundry, roller blading etc. The output should be: background coloured, symbol in black. Interested candidates will receive a sample to know what is it all about. Design/Creation is up to you, there is only one prescription: the statement of the pictogram must be unambiguous. I am looking forward to receiving your bids! Kind Regards Christenino