Posted: 18/09/2014 at 18:17
Is the shed currently sitting on concrete? What direction does the garden face?
There are two things you could use to cover the concrete path and/or shed base - gravel and chipped bark. However both will have problems keeping in place - you will need edging and neither are particularly good for a seating area unless you go for benches rather than chairs because the surface will not be stable enough for chairs. Decking might be a better option for the seating area despite all its faults.
The back wall can be hidden by fixing some 6x6 trellis panels and growing scented and/or evergreen climbers up it. The rest of the garden needs a tidy up - grass cut regularly and the borders edged and weeded. Again climbers can be grown up the fences or some espalier fruit trees.