The best Flip Cover options I got for your Micromax Canvas Spark are:
Flip covers from Molife. The Key features of it are that it comes with an attractive Black color with 4 Corner Protection. User ratings say that it is quite protective as well as durable with a lightweight body. The Design is done precisely keeping an eye on the easy access to every button and ports and also that it does not come in the way of the Camera Lenses.
Right now you can get it at Rs.349 from baniyadeals
The other option is Flip Cover from Fabcase that comes in Brown Colour , the Case is of PU Leather Material Belt Pouch. It protects your phone from scratches, dirt, drops, bumps and other damages.
The make is of quite high quality with an assurance of durability with an elegant look where you don't need to compromise on its functionality and ease of use while protecting your phone against slipping off, scratches, breaking or cracking off. It has a good grip, with a soft touch.
It's exactly as it appears in photos
Currently they are sellling it only at Rs.190 from indiacod.com
Hope you can choose one from them.