Just as a start, I should think that Japanese Maple (Acer Palmatum) of a variety that won't grow too big for a container, and some conifers, including some that might be pruned into what I believe is called "Cloud Pruned" shape (i.e. resembling pom-poms) might look compatible with your friends' garden, so long as they were placed in suitable spots. The containers themselves should, I suggest, be as plain as possible & made from wood or, if ceramic, of sudued colour with no, or very little, ornamentation.
To help in assessing the situation, could you post some pictures of the view of you friends' garden from your own site, and of your own space, taken from various viewpoints?
Last edited by Herb3
on Tue Jul 21, 2009 2:34 pm, edited 1 time in total.