get a head start on the cold weather and get a few 10cm posts, sew 6-10 seeds of the following (1 variety per pot) Beetroot, spring onions, turnips, carrots etc, then when the soil warms up pop the lot in the ground (Minus the plant pot) and the bulbs will naturally push apart and give you a clump of veg - just allow more space than you would for an individual plant as the bulbs will take up more room underground as they push themselves apart.

Also - large padded bubble envelopes make great propogators, they need to be checked daily as theres not much air once seedling emerge. They can be re-used again and again.

tyres are a hinderence to the environment but can be used in the veg growers garden - stack up for a potato planter, tractor tyres are huge and make a great raised bed as they are! You can even use a jigsaw to cut the tread off car tyres, open into a strip, rivet them together in a long strip and make a wall for long raised beds. Great recycling if youre DIY savy