Marie, you could buy or or easily make what is called a shadow box which is nothing more than a shallow-sided box and arrange your flowers unpressed ... I use these boxes for dried real flowers which don't press well or just "because". lol

Making your own box you can size and design for your exact needs and best of all it's free.
I make boxes about 2 inches deep from wood scraps or even heavy cardboard, also styrofoam is great, then cover with wallpaper samples or reycycled cloth... in your case maybe satiny or lace remnants fom old sleepwear? The box can be covered with glass or plexiglass to keep out dust but I don't generally bother.

But you can of course press your flowers if you'd like. They would possibly still need a deeper frame than usual because they would no doubt be bulkier than real pressed flowers.

I admire you for holding down your wedding costs...and wish you all the best. Email me thru clicking on My Page if I can help further...good luck. josh