"Washboard" is a great term and micro-undulations splendid. Apologies Mark but links courses do come to mind first.
The Glashedy course at Ballyliffin is, IMO, an example of a lack of micro's on a links. A legacy of 'big machine' construction? Now the other course at Ballyliffin, the lovely Old course, well micro's abound on it.
A fine example of micro's is on a lesser known and visited links, the delightful, understated Dunfanaghy, which from a distance looks to be a mainly very flat course. But, initial appearances are deceptive, nothing is really flat at all. Gentle folds, subtle rises and falls, dips and humps and hollows abound and a level stance or flat lie is the exception rather than the norm.
Here's a typical lie and stance, target in the distance, feet on one side of a hump giving an uphill stance, ball on the other side of the hump giving a downhill lie.
And here, in front of the 5th green, is the kind of mild yet still bumpy terrain in front of the greens. You kinda want to play a bump-n-run but can you achieve success over these undulations? If not, can you fly it all the way and stop it quickly enough on the very firm and smooth rolling greens? Your choice!
UK Inland courses? Good example of rig and furrow terrain from Bill. Downland (upland?) and moorland courses come to my mind, especially lower budget ones where accumulations of molehills and ant-mounds and the sides of no longer used yee olde footpaths and tracks, even building footing, tend to become little grassy humps and ridges over time, although I'm not sure this was quite what you had in mind.
atb