I made them on Saturday night and the recipe said I could put them in the fridge to prove overnight. When I took them out in the morning not only had they not risen, they'd dried out on top. So I brushed them with milk to soften them and put them in a slightly warmed oven where they did their thing slowly and came out looking slightly dodgy from expanding while being slightly dry on the surface. Still, they look like croissants don't they!
(I salvaged the extra bits of dough and made little rolls with them which is why some don't look particularly croissanty.)
The oven was supposed to be at 200C which proved to be much too hot and I almost burned them, luckily I realised in time, turned it down, and they only came out moderately brown.
They were perfectly acceptable croissants and with a few adjustments in the recipe and technique I think I might achieve pretty damn good croissants. It's labour-intensive but instead of paying $2.50 a croissant I'm guessing these cost at most 20 cents. My plan is to make a couple of batches and freeze them prior to the second rising, then just pull them out as needed. Imagine having a freezer-ful of pain au chocolate or almond croissants as well as plain ones!
ETA: The recipe I used comes from Alison and Simon Holst's Bread Book but there are lots of recipes online too. I'd be a bit reluctant to post the recipe up anyways, but you need all the diagrams to show you how to fold everything and there is no way I'm drawing all those out!