Hi boogieman,
It depends where you want to put them and the soil type and important what you like, its no good planting things what you dont like.
Can you describe the area and if possible take some pics as its easier to see from pics..
Is it only flowers or shrubs and climbers what are you looking for.
I found this link it looks interesting as it tells you what the plants are good for.
Wildlife Extra - Garden Wildlife - Plant list for a wildlife garden.