AirToob Lightning
There is so much more to this site than the title suggests!

From the intro:

"RedBubble is a forum for self expression, an inclusive art gallery and a supportive and welcoming community...

"The RedBubble community exists to challenge the elitism of the traditional art world."

Among other things, RedBubble is a place to easily find many great photos and paintings. You can search RedBubble for images with any characteristics you want, e.g. the following:

nature fog water lake boat light sunrise sunset wildlife still-life

abstract bubbles crystals fractals

people portraits glamour children

France Provence Italy Tuscany Umbria Switzerland

oil acrylic pastel watercolour watercolor stained-glass

You won't actually find a list like this at RedBubble. These are searches I thought up that produce good results for me (they open in a separate window, just close it when you're done). If (like me) you're new to RedBubble, why not try a few of these and then "roll your own"?

Note that RedBubble no longer has an "advanced search", but you can search for two or more tags separated by spaces, which it treats as an 'AND' combination.