I recently came across this interesting seal by an artist named Wu Shijie 吳士傑. I haven’t been able to find any information about him other than that he might possibly have lived during the Qing dynasty (1644–1912).
It’s unusual to see a seal from this pre-modern period with the characters slanted in different directions like this—which makes it look very post-modern.
The six characters 清閒且樂昇平 (Enjoying peace and leisure) are read in a common arrangement from top to bottom and right to left.