We tried a range of images. Here are some of our favorites.

We were really drawn to minimal lines and curves. Lines that ran vertically worked better for us than horizontally.

We really liked natural/organic patterns, like this one of burnt wood.

Greens and blues worked really well on the screen.

Here are some other images that we liked that we did not take photos of on the screen (images tk).
https://drive.google.com/open?id=0B1Dmkmkm0Q4pUDFsTzNHb1dzMjA
https://drive.google.com/open?id=0B1Dmkmkm0Q4pX0ZhVXdqYXNqNFU
https://drive.google.com/open?id=0B1Dmkmkm0Q4pYndpZm05a0I5NVU
https://drive.google.com/open?id=0B1Dmkmkm0Q4pXzI5SkZ4cHlhakE
https://drive.google.com/open?id=0B1Dmkmkm0Q4pUDVZRXJsZVBZczQ
https://drive.google.com/open?id=0B1Dmkmkm0Q4pYi16dk5wb0RzRlE
https://drive.google.com/open?id=0B-fisfkJHH5dSEszU2NOdk1MMlU
https://drive.google.com/open?id=0B-fisfkJHH5dSVNta09PenloUGs