Chequered

From a bird's-eye view, Los Angeles looks like a chequered carpet.

He has a chequered past.

Tom has a chequered past.

The trees lay on one side the road in a rich depth of shadow; on the other the golden light seemed to rain through the chequered boughs: a subtle fragrance floated on the air, and the carols of a thousand birds rose distinct above the deep murmur of the city that they had left behind.

The history of cast iron in railway bridges is much more grimly chequered. Brunel's misgivings were proved prudent, tragically, in the 1879 failure of Thomas Bouch's Tay bridge (once a monument to cast iron, now a memorial to many lives lost).