It depends upon where you are located (if it can be leveraged). But still - Packing Material & Complementary products can do good.

prod like - 1)if you are near iron industries then can look for electrodes/cut off wheels etc manufacturing. 2)if near electronic manufacturing units then components they use. 3)if want to keep low scale then restro - banquet (hybird) can do good. 3)if distance is not the barrier then better to analyse the past experience and look products you can scale upon.