The "cherubs" in the Temple were exceptions to the usual rules against representational art. Some of the cherubs were embroidered (Ex.26:1,31; 36:8,35), but the ones on the cover of the Ark (Ex.25:18-20,37:7-9) were solid. There will also be cherubs in the Third Temple; see Ezekiel 41:17-26. Also, G-d is described as mounted on a cherub (2 Samuel 22:11), and cherubs also served as guardians of the Garden of Eden (see Gen.3:24; Ezekiel 28:14-16).
Ask a follow-up question