Mine is soft and pink, definitely not official, cut down to single bed size (so it doesn't drag in the mud), with every kind of badge on it - guide, scout, tourist badges from places I've been, swapped badges from other countries/camps, badges I've bought/swapped from other guidey people, patches for bands, music festival wrist bands, charity badges, school badges, it is a record of my life and I love it. It is now full, and every time I want to sew on a new badge I have to move 3 others...
Just get a lovely soft blanket and be prepared for sore fingers from the sewing! I've added "pockets" to mine for the pin badges so I can take them off in one go and wash it, I've seen ones with sashes sewn on whole and they look great!
I spread my badges out from the start but now regret it as I have to move them to optimise the space, so you may be best starting at one end.
There is a facebook page for badge swapping/buying when they get a bit older, and when you send them off to camp make sure they take spare badges (buy them from the fb page or the girlguiding shop) then they'll come back with a load more!
WhiteWine not out of touch don't worry, camp blankets only come into their own when they run out of space on their uniform or start going to camp. They're more relevant in Scouts as there are certain badges they can't wear on uniform, or only for a set time.