I looked for lumpy mattresses, lumpy seas, lumpy clouds, lumpy anything - I didn't really come across something that had me jumping up and down with lumpy joy - so in the end I settled for a cluster of clumpy, lumpy and uneven seaside rocks.
I had the same problem- couldn't think of anything in my house that was remotely close to the word "lumpy" to add to the daily abstract. I think your stand-in works better than mine. Good shot!
Thanks, Kathy! Yes, these are lava rocks that have been moulded and weathered by centuries of wind and seawater activity.