I thought I'd share a bit of loveliness from Oh So Beautiful Paper (top image), and then another option that might work better for those on a time and/or budget constraint (bottom image).
The top image is actually for a bridal breakfast, but I love the idea of carrying the whimsy and romance of a hot air balloon ride throughout a wedding suite. My "Love is in the Air" invitation suite is perfect for this. It's fully customizable, from colors to fonts, and is also available as a print-it-yourself file if you're more the DIY type.
To get the look of the top invitation, I suggest coordinating ribbon from Hobby Lobby or Walmart, and box mailers—like this one here, from Papersource. Tuck the invite into the box with some pretty crinkled paper shreds, such as the ones here and violá!*
*I am also perfectly happy to customize this invitation to fit a shower, bridal luncheon or other event, just email me through my website www.benignobjects.com.
**Print-it-yourself pricing on the Love is in the Air suite starts at $65 for the invitation. Flat printed pricing starts at $150 for 50 invites.