I love decorating with pictures of my family and things that I love.... like my kids' art work. I also like picture "groupings".
Sometimes I use all different frames and mix color with black and white photos:
Sometimes I stick to one color and style of frame:
Sometimes I stick to a "theme". Like by my front door I have a group of black and white old family photos. They include pictures of my grandparents at their wedding and honeymoon and pictures of my mom as a little girl:
And sometimes I just group things together that I like; like old post cards, and words or expressions that i've printed on the computer: