Does it have to be 'sheepy'?
Knitted hats are very popular at the moment, especially those with the ear-flaps and dangly bits of cord - I'm sure there's a name for them?
Off the wall - what about Sheep Poo chocolates? Like you get Reindeer poo chocolate at Christmas? I've just googled that and found "Yorkshire Sheep Poo" which is chocolate covered raisins. I'm sure you could personalise it to your flock? (Google is my friend
)
What about a big knitted sheep and have people guess it's name? For a fee, of course. Winner gets the sheep. Of course if you call it Mucilaginous
or some other bizarre name, no-one will win. If it's too obvious many people will win. You could refine it and you get to choose the best name?
My final suggestion at this early hour is home made Mint Sauce. Sprigs of fresh Rosemary? Rosemary Salt?