by generic, i mean, not specific places of worship but the general design as belonging to different faiths. here are some options:

cathedral (christianity)
http://i.telegraph.co.uk/multimedia/archive/01245/truro_cathedral_1245637c.jpg

i'm not a fan of cathedrals, personally. they are almost too obviously designed to be imposing: look, here's what we can do with our slaves and this is what you will build to, if you cross Him. too busy as well with all the towers and almost gothic motifs.

mosque (islam)
http://3.bp.blogspot.com/_jXNyvNsF2To/TFcleWrA4jI/AAAAAAAADEA/z--YoedNEoE/s1600/Royal+Pavilion.jpg

it's a classic design. the simplicity of the design is more effective on small mosques, imo. too many domes spoil the broth, after all.

gurdwara (sikhism)
http://www.sikhismguide.org/images/gurdwara.jpg

there's a couple of gurdwaras within walking distance of me, on account of Leicester's originally Ugandan immigrant population. i like them. mosque-esque, but (from my experience - i'm not sure of general rules?) more minimalist with fewer domes and unnecessary towers, which works in their favour.

shinto buddhist temple (buddhism)
http://upload.wikimedia.org/wikipedia/commons/1/15/Buddhist_Temple_on_No._5_Road,_Richmond,_British_Columbia,_Canada.jpg

a cursory google suggests to me that buddhists are more flexible with their temples but what comes to my mind for me is the classic shinto design as shown above, though hopefully there will be some pagoda chat in this thread below. a buddhist temple is inherently a curious idea i guess; the aim of course being to excise earthly pleasures, and the amount of work that clearly goes into these temples suggesting they have in fact failed in their task - perhaps the buddhist desideratum is, in fact, to be as cool as fuck.