pillow/cushion closures

[kachina.livejournal.com]

i'm in the process of making seat cushions for my outdoor furniture and cannot decide what kind of closure to use on the cushions. my original plan was to just sew them closed, but i've decided that i will want to wash them once in a while so i should go for a closure in which the cushion is easily removable. i've considered using velcro and buttons, but neither really does it for me. any other ideas?? or perhaps someone can recommend a site on the topic?

thanks!!