Posted: 25/12/2014 at 12:36
Partly it's a question of aspect. If those trees were shading out the garden, then you don't want them back. If that's the north side, I'd go for some nice trees. Something native, low-maintenance and dense-growing that'll be good habitat for birds ... a bit like what you had before.
The pond idea sounds good. They're a big job, though. Much deep digging and serious building required to get the proper base, deep enough, with a good drain for the overflow and natural water supply to keep it topped up in summer.
For something a little more garden-like and less wildlife-centred, you could screen the far side of the shed with a hedge or some climbers on a trellis fence, screen off the farmland with a nice, dense hedge, screen anywhere else "open" in a similar way, plant a ring of fruit trees, plant shrub roses inside them and have a little area in the centre with a seat where you could sit in peace, surrounded by roses. Maybe "gorgeous flowers, shame about the fruit" cherry trees instead of "ugly but we get a great crop off them" fruit trees.
Silly suggestion: put in trellises in parallel rows, run wires up them too and plant various twining climbers under them. Let different species of honeysuckle, akebia, jasmine and the like fight it out. Have a pedestal somewhere with a good view, and take a photograph from that pedestal every week. After 5 years, assemble the photographs into a 25-second animated .gif and let us all watch the plants wrestle.