The best layout idea is when you place it underneath the bed in a way that there is an 18 gap between the top of the rug and the start of the nightstands.
King size bed 8x10 rug.
For king beds you might need to increase the rug size to 9x12.
King sized beds are generally around 76 wide 6 4 and 80 long 6 8 so if you add two feet to the width you ve got 8 4 and a foot to the length you ve got 7 8 so therefore an 8 x10 rug is going to be cutting it pretty close dimension wise.
The nightstands is completely off the rug.
An 8x10 extends the room.
Bedroom rugs in your bedroom place an 8x10 rug under your full or queen bed and arrange it perpendicular to the mattress.
Adding a bench at the end of the bed would be a suggestion however this will hide more of the rug.
274 x 365 cm.
An 8 foot by 10 foot or a 9 foot by 12 foot area rug will fit the bottom two thirds of a queen size or king size bed but not the nightstands.
A california king size bed measures 72 inches wide by 84 inches long.
243 x 304 cm.
For a symmetrical finish an 8x10 rug is best for queen beds and a 9x12 for king.
Make sure there is about 3 feet of rug showing on both sides of the bed to achieve balance.