Scalloping

Maybe something like these?

http://www.google.com/imgres?imgurl=http://www.djarv.se/bilder/sked_alla_vä_popup.gif&imgrefurl=http://www.djarv.se/djarvenglish/skedknivar.asp&h=606&w=900&sz=453&tbnid=WJiNFsgIGn8G-M:&tbnh=90&tbnw=134&prev=/search%3Fq%3Dspoon%2Bknives%26tbm%3Disch%26tbo%3Du&zoom=1&q=spoon+knives&usg=__adlSJ6mLE2M_3hLpEggXrKftA9I=&docid=nf8ScjQhji80gM&sa=X&ei=gicqUcjcKIjntQaRmoHQBQ&ved=0CEYQ9QEwAw&dur=2608

-- Mike, American in Norway

How about a grinding wheel. The box sculptors on this site create scallops with sanding discs and grinding wheels.

-- Made in America, with American made tools....Shopsmith

Scrub plane?

-- Brian in Arlington, TX - Laziness is the foundation of efficiency.

You might want to try using an adze to achieve your effect. The craftsmen at Robert Thompson Furniture (aka The Mouseman) use them to produce table tops like this
http://www.robertthompsons.co.uk/images/category/table_l.jpg
Hope this helps.
Jim

-- It always looks better when it's finished!

JR45 has a good idea there, also google scorp, these tools are made in many sizes and might work for you.

-- As ever, Gus-the 74 yr young apprentice carpenter

First thing that came to mind was a scrub plane (as BTimmons suggested).

-- "hold fast to that which is good"

picture of scalloping with a scrub plane :

http://www.theunpluggedwoodshop.com/made-by-hand/project-2

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn