Choose a fabric appropriate for such an application and make sure it has the desired transparency properties that you need for the room. Decide where you'd like your roman shades to fold as they are pulled up, and mark the corresponding mini blind slats, then remove the rest but leave the cord mechanism in tact. Finally, simply fabric glue your textile selection to all pieces of the remaining mini blind product, being careful not to adhere to the cords. Then let dry and hang!
Check out the easy five-step tutorial at Scoutie Girl — Acute How To: Now Sew Fabric Blinds. Images: Scoutie Girl