Thanks so much for your interest in a custom piece from flora & phrase. My options for custom listings can all be found here.

My suggestions for sizing are as follows:
2x4: best for one to five word phrases and quips 
4x6: best for two to fifteen word phrases, quotes, and quips 
5.5x6: best for ten to forty word phrases, quotes, quips, or a poem if ten or fewer lines 
6x8: best for thirty to one hundred fifty word quotes, poems, and vows (or anything shorter, if you'd like more white space) 

Any questions can be sent to, or directed to the chat box in the bottom righthand corner of the page.