There are many shades of blue from the darkest navy reminiscent of a night sky to the palest duck egg. Light blue is often a color chosen for classic kitchens for its freshness – it certainly has a hygienic feel to it but you have to be careful in case you choose a shade which gives your kitchen a cold rather than a welcome feeling.
Whereas pure pale blue can feel a little on the cold side you can warm it up quite a bit by adding a hint or two of green. This will give you a range of colors from blue green aqua and duck egg to rich turquoise.
Blue has great potential for mixing with other colors and goes well with many shades. You will find it combines well with pink and yellow in chintzy type floral patterns which go well in country kitchens. Also you can use a darker shade of blue if it is broken up in a toile type pattern or in a gingham or striped fabric.
Blue used in contrast to more cheerful colors works well in a kitchen, For example you might have sky blue walls without suffering the frosty look if you cheer them up with sky blue and yellow striped kitchen curtains or blinds.