Have bought a Roman blind for DD3's bedroom. I had two choices - perfect width but either 6cm too short or 24cm too long (or 30cm too wide and the same length problems).
So, while it's not a major problem (she has bits on her windowsill so the 6cm wouldn't be a problem at night, for now anyway), I would like to add something along the bottom - would it be best to buy some kind of tassel trim and attach to the back, or to make a strip in a contrasting material, attach and perhaps 'hide' the join with some ribbon or similar...? Obviously I would do more than just cut a piece of material, I can sew pretty ok-ish 
Any ideas on a. what's best and b. how I should do this would be lovely....
TIA 