Any Ideas for a supercheap black and white "retro" wedding?

Hi,
We are getting married next summer and so far have come up with a black and white (with dark red accents) retro theme (maybe 1950's post war). (It's going to be in an old fashioned Village hall and I quite want to serve sausage and mash and bread and butter pudding type event). The whole wedding thing in that time was all about the marriage and staying together which is something nice to work on and our venue and the whole cheap and cheerful nature of it means the theme fits quite well.

There is a lot of cross over between 1950's, 1930's and Hollywood glamour themes so I am trying not to get them all muddled up else it may look a mess.

So far some ideas I have:
Asking guests to bring "potluck" instead of a gift reduces catering costs and fits in with the cheap post war theme. Struggling to come up with a post war buffet menu thing though- not too keen on tripe! (we are having 100-150 guests- probably cater for 100 then further 50 to evening do)

Black and white balloons inflated at each table (undecided about this one as balloons sometimes look naff but then I saw a pic where it looked amazing)

Black and white photo montage of me and OH as we grew up (hopefully with matching photos- eg. riding first bike etc.- these may be on both a powerpoint type thing as well as the table settings.

Black and white dancefloor- they may be stupidly expensive to hire so my other idea is to buy a large piece of the black and white lino and tape it down! Then keep it to use in our bathrooom or something! Maybe some white and black drapes or even bunting (although that may look a bit race tracky!)

My dress is black and white (£60 from ebay originally cost £1800!) so I think I may carry 3 white lillies or something.

Bridesmaids will be in black and white- maybe 50's style dresses if we can find some.

Invites may be a black and white baby photo of me and other half with old fashioned lettering.

Any other ideas? I don't want it to cross over into Americana (Juke boxes and red leather seats) or Hollywood glamour (directors chairs and pouting) too much but I do want to steal the best of their ideas that would work well with my theme.

I think I will have old fashioned sweets in bowls on the tables- fruit salads, blackjacks, cola cubes etc.

Favours are being made by a friend- they are seed packets of honesty which I will get black and white envelopes and make a poem for.

I was thinking place settings could be a black stone with the guests name written on but then maybe that is too "earthy" so my other idea is I have some deep red price tags on red string (sounds awful but they look nice) and simply writing the guests name on them and attaching it to the wine glass (will help them find their glass too!).

I also love ostrich feathers and butterflies so was thinking decorating the tables with black and white ones but then feathers maybe are "too hollywood" I don't want to "overtheme" my wedding and just have too much.

I wasn't going to bother with a car but then my other half is obsessed with VW camper vans and his stepdad has one he might be willing to drive for us- its a bit more 60's but it could be a lot of fun- or we could get a vintage black 1950's one and just hire it.

Not sure if we can afford a swing band but brother is dj-ing and I am going to get him to play some peggy lee and the like.

Can anyone help me with any other ideas? Cheapness is the key. My budget is £3k I can go over it if I wanted however I abhor the expense of weddings and the whole wedding machine so I really want to keep it cheap and cheerful.

Cheers
Miss C.