While not exactly free, I've found some interesting designs in children's coloring books.
Another place to look for ideas are those catalogs that sell plaques and tee shirts with funny sayings. Speaking of catalogs, the wife gets scads of needlework catalogs. Some of those designs are pretty neat, too.
'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton
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