I found the picture of a production of Giblert & Sullivan's Gondoliers at the Northcott Theatre in Exeter. I added the sentiments in Publisher.
I created the curtain by printing on to flocked paper, so it feels like soft, plush material. I spent a long time this afternoon printed on to a piece of red velvet paper which looked much richer than this, but, unfortunately, when I was in the process of sticking it on to a print out of the G & S picture I tore the velvet paper, so I had to resort to this instead. Having stuck it to an A5 card I cut round the edges of the curtain to make it a bit more realistic.
Quirky crafts 16: let's do the numbers
Birthday sundaes 21: birthday card
Anything goes 47: happy birthday/celebration
Spoon full of sugar 162: happy birthday
Tuesday throwdown 61: birthday
Creative craft world: birthdays
Inky impressions 21: birthday
Cardmakin mamas 26: birthday cards
Craft your days away 26: birthdays
Creative CAS August: birthday bonanza
Creative Belli 123: non-paper - the curtain is flocked
Update: took the card to the person who ordered it and she was absolutely thrilled with it.