security envelope patterns

I've had an abnormal number of bills this year, I was pretty sad about them all until I noticed that every envelope isn't printed the same...  I have been saving the envelopes all summer and I'm getting ready to use them in my newest paintings!  I will probably make a handful of my own repeating patterns as well, but here's a preview of the 4 patterns I will most likely start working with.  Peace-


 
P.S. I searched to see what other people have done with security envelopes, here's what I found- http://tinyurl.com/3e9y5c7