Can I make it (better)?

Sometimes I come across something interesting and wonder if I can DIY and customize it. This requires some thought and investigation into what's possible given current technologies, what might appeal, what might be maximally useful as well as considerations regarding cost. Sometimes I just want to see how far I can go in terms of making it come to life.

Some things I'd like to give a hand at designing include -

• A cat litter changer 
• Lights programmed to light up or out based on sunset and sunrise
• A programmable drawing robot
• A musical infants cloth nursery book
• Dog patio grass design
• Selfie drone