Rather than trying to 'think up' a couple of specials for every night of the week plan them out a couple of weeks in advance if you can.
Really helps for those days that you just don't feel creative.
Also some ideas that may assist you:
- have a goal for your specials (re-purposing), getting rid of slow moving product, trying out a product that you might want to add to the menu
- try having your lead cook or one of the line cooks make up a special *always try it first and be honest / polite about the whole thing
- ask your regulars if there is anything that they would like to see as a special (we actually have a short *call list of regulars when we do certain specials that they love... just call and leave a short message (be very brief) you'd be amazed at how much business this can drum up.
- use the nearest holiday for 'inspiration' or a theme... doesn't have to be the same day just near
- make a special that uses the same ingredients that you normally have on hand just prepare them a different way
- make comfort food specials, as much as it's not exciting / fine dining i've always found basic baked mac-n-cheese or sheepherds pie always sells well.
- use what is in season for your specials (it's also likely on sale)
- use your suppliers 'deals' or 'specials' as your specials (beware that you may become 1 of 10 different restaurants that are doing this also)
Anyway hope this helps, i've probably missed half a dozen other good ideas but i'll leave that up to the rest of the gang!