Gargoyles, but you need a quite decent slayer level to kill them, people say they drop more often than gold there.
When I trained range on fire giants i got like 100 blue charms or more their not likely to appear though that's just one of the monsters that drop them try going to a runescape help site and type in monsters that do drop blue charms.
There is no such thing as Blue Shards, however if you meant "Blue Charms" I have provided you with a link below that should provide the answer(s) that you seek.
hellhounds drop 100% bones. they also drop charms,gold,green,crimson, and blue. and clue scrolls
One of the fastest ways to get a lot of charms - including many blue charms - is to kill rock lobsters with the spell "ice barrage". Note that this spell requires a high magic level, and a lot of money. Otherwise, I would suggest you just do slayer tasks - preferably from the highest-level slayer master that is feasible for your combat and slayer level - and not worry about what type of charms you get; however, the genral tendency is that higher-level monsters give you better charms (for example, less gold, and more crimson and blue).
Well, A cheap way to do it is just killing gargoyles.. They drop a fair amount of blue charms.. Usually more than gold. Bork has 100% drop rate of 5 charms but you can only kill 1 per day. Kbd, Mithril dragon, Aquanite and few other drop it common. If you have enough hunting lvl to catch spirit impling, it also have fair rate of loot.
Pandora charms come in a wide variety of color. Every month they are coming out with different combinations of colors. The latest red and blue charms are Pandora London Bus edition which sport an enamel flag.
You can: 1) Buy them on the Grand Exchange. 2) Make them yourself, by smelting gold ore. The gold ore, you can buy from the Grand Exchange or get from a gold mine. EDIT: They can also be obtained as a Monster Drops from the likes of Gargoyles, Nechryael, Greater Demons, etc.
The Blue Monster is Doral.
Blue Cookie Monster
because all the cookie he eats made a infection so if he east cookie monster eats cookies he will stay blue.
No
Blue Monster? It is a golf course at Doral.