If you look at my journal I only bought 2 kg of aqua essentials rock and I managed to get 5 nice rocks out of it (after smashing up a big one). In the pictures they look like two as I have bunched them together though. It is soooo easy to spend £50 in AE. Buy some crystal reds, plants or some lily pipes.
My CPDs aka galaxy rasboras have the nice red, but haven't fully "blued" up yet. I thought they were going to stay the same colour but since rejigging the plants in their tank they have coloured up quite a bit more. The ones in the blue planet were awesome.