This is a great place for stitches and motifs of all kinds.
http://www.knittingfool.com
This is the main page. At the left, you can search by stitch count. If it is on the sleeve and you want part solid stst and part lace, you could put the lace just at then center of the sleeve.
I would select a pattern where you can center the lace. Just calculate how many stitches you need at the shoulder (if you are doing a traditional set in sleeve, because this is the part you want to have centered. Be sure you have enough stitches at the cuff and you should be alright.
If you want an all-over design, then you should also be able to find a design to cover the entire sleeve.
This is a great place to explore. Hope it helps.