The material. Some coloring books offer the ability for the child to simply run over the surface with the pens or crayons provided, and it will turn out to be the right color regardless. Some are more like paint books, and some have magic marker surfaces and come with markers that will not show up on any surface but the specially prepared book pages. Choose the book that best suits you and your child. If you are worried about markings on the walls, then don't select a pack of basic crayons, get something that uses special crayons. If you want your child to exercise their own creativity and not have to fit in the lines or color schemes planned, get basic pages. It is up to you.
Best of all of course are free pages that can be printed out at home any time you like. There is so much variety obtainable that as long as they have their pages and something to color with a child will never get bored. For many children, there is no greater gift they can give to Mom or Dad than a picture they coloured all by themselves. Inside or outside of the lines, any page coloured with love and happiness is a masterpiece.
Variety. Most websites have both online coloring books and printable coloring sheets. This offers a huge variety in coloring activities and images. The variety offered enables parents and educators to introduce new coloring projects on a daily basis. Some of the categories of coloring projects that you will find on online coloring sites are characters, animals, holidays and educational lessons. A great holiday activity would be to find a printable coloring sheet for the current holiday and have the children decorate it.
Greek did not have a /ʃ/ phoneme, so the derived Greek letter sigma (Σ) came to represent the voiceless alveolar sibilant /s/.
While the letter shape Σ continues Phoenician šîn, its name sigma is taken from the letter samekh, while the shape and position of samekh but name of šîn is continued in the xi. 
Within Greek, the name of sigma was influenced by its association with the Greek word σίζω (earlier *sigj-) “to hiss”. The original name of the letter “sigma” may have been san, but due to the complicated early history of the Greek epichoric alphabets, “san” came to be identified as a separate letter, Ϻ. Herodotus reports that “San” was the name given by the Dorians to the same letter called “Sigma” by the Ionians.
That said make sure that the kid prints those coloring pages on a used sheet of paper and tell the kid not to waste paper. That way you will also make sure that he grows onto to become and environmentally conscious individual.
It is actually imperative that you care for early childhood education. Kids adore online games though hate learning at times. At the same time, the childhood is the perfect time period to get education. Hence, it is a great teaching method to put together different games and the learning process. That way your child may enjoy different interesting online games and also discover new things. Children do not like learning mathematics as it is very boring. But the great thing is you can find a solution to that problem. Nowadays you can buy many different color by number video games, which may be fairly effective.
You can give your kids something fun and exciting with Winnie the Pooh coloring adventures. This is one of the most widely recognized characters and it is certainly one that parents can feel good about their kids enjoying. After all, he is friendly, smart, and very generous to his friends. Those are all traits we want to instill in our own children.
Printable coloring pages can also be used for other purposes, like coloring contests. Many times the sheets left out on the contest table get wrinkled, ripped and ultimately unusable. So, find printable coloring pages online that you can send your patrons to! All they need is a home computer and a printer and they will have their contest entry picture. If they don't have a computer at home, print them off their printable coloring pages right on the spot!