Make do and mend coldframes...ideas?

Hi everyone!
I'm looking for creative ideas on how to make coldframes with the minimum of fuss. I have a selection of glass panes on my allotment but I don't want to spend loads of money on wood. I seem to remember someone on telly painting cardboard boxes with gloss paint and then putting glass over the top. Any ideas gratefully accepted!
Bright Blessings!
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Got any bricks ??
Dry build, a brick box like structure - put the glass over the top.
Go to your local market and ask the meat/fish sellers if they have any polystyrene boxes. They usually chuck them out at the end of the day and once thoroughly cleaned (the fish boxes need a good airing too) they make excellent cold-frames.
Aitch
I'm using the inside of our old dishwasher covering the top sometimes with a piece of clear plastic!
Thanks everyone! I sometimes spend more time working on recycling projects than on actually growing anything!
what i did i had some old green house staging that i was not using so i put this out side my green house and i would stand the plants that i grow on this so plenty of air was round them,as for cuttings i would wait until they have developed roots and big enough than i would put them out side,i would just put some lastic round the frame,
Big polystyrene fish boxes are good.