*Assuming they have not been married before*, something on the lines of a "Wedding Present Lite".
Think of what you would buy/spend on the wedding present, then wind it in a bit.
P.S. * they may have a lot of stuff already.
Place said wheelie bin on it's back, open lid facing skywards, take dump, close lid and return bin to it's upright state.
That's how our ostriches do it.
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Me and my pal Scotty plan on wearing our normal clothes but putting one of those paper boiler suits over them.
You realise if things go all Pete Tong on the Halbeath Road, your already suited and booted for the cells.