The Make Lounge is such a brilliantly executed concept. They offer a range of hip and crafty workshops that are perfect for the modern creative. I took this cake pops class there last year and it really was such fun. I've been dying to return and I just saw that they are offering a host of new classes. Chocolate making, paper cutting and screen-printing in particular caught my eye.
Most classes are in the evening, lasting 2-3.5 hours, although Saturday classes are offered too. The workshops are social and laid-back — perfect for night out with girlfriends.
(Photos and my thoughts of the cake pops class here.)