Wow, that's a hard one John. Personally I don't of any button patterns specifically for scrolling, but suggest you do a Google for pictures of buttons, select those that your wife likes, download them into either a photo software (e.g. Photoshop) or a word processor (e.g. Word) then turn them into line patterns that you can print out for scrolling.
As a matter of interest, which wood species/es do you think is suitable for buttons?
hi never gave much thought to the type's of wood - typical fly by the seat of your pants job - I have some bits of Mozambican timber I got from stiles and bates, could try that , I have just chopped up an old chair that is oak for sticks for the fire , was not much use for anything else, kept the seat for future use, hope Sandra hasn't used them - shes a coal miners daughter anything goes in the fire - could salvage the rails for toggle buttons.
Hi John, if I understand you right, you're looking for animal shaped buttons, if that's the case then google animal silhouettes. shrink them down to the size you need and drill either 4 or 2 holes in them. that's what I would do if asked.