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Kids Area for trampoline!

We would like to flatten our rear section so require a retaking wall. All I want is the ground level to go up to the level of just above the house foundation. So only about 1.0-1.2m height, and about 15m in length, basically from the edge of the driveway along and then we have a funny kink area in our boundary. We have bricks here as took our chimney down. Could either be used as hardcore of maybe in a Gabion Basket? We won't see the retaining wall at all as above it, so doesn't matter how it looks. The surveyor has marked out our boundary position with bright pink pegs. I was going to plant a hedge around the boundary. Many thanks Andrea As cheap as possible! Won't see it!