I as many of you know live in 'Sunny'(sometimes) Sussex in the UK. Over here on our BBC Gardening site they have a section where you can construct a 'Virtual' garden on the screen. I have used it a few times. It does give you some idea what the proposed layout of you planning may look like. Perhaps this could be made available to you fantastic folk on this site.Its worth a look.
bbc.co.uk/gardening is the web site.
And guess what, they have just changed it out of all recognition recently. I think it is catching.