HINTS
^= power 
We should like to apologise to any four wheel drive vehicle enthusiasts who have
found this page through a search engine and are just a TINY bit disappointed.

(See below for the TOUGH version!)
The Rules:
1 = 44/44
2 = 4/4 + 4/4 = 1 + 1
6 = (4+4)/4 + 4 = 8/4 + 4 = 2 + 4
12 = 4 x 4  SQRT4 x SQRT4 = 16  2x2 =16  4
25 = (SQRT4 + SQRT4)! + 4/4 = (2 +2)! +1 = 4! +1 = 24 +1
55 = ((4!!)!! + 4!)/ 4!! + 4 = (8!!+24)/8 +4 = (384 +24)/8 +4 = 408/8 +4 = 51 +4
75 = ((4!)^SQRT4 + 4!)/ 4!! = (24^2 + 24)/8 = (576 +24)/8 = 600/8
Let us know how you get on!
A lot of numbers have more than one solution, but if you get stuck, Sunny gave us the answers!
If you've found the challenge too easy so far, then why not do what MICHAEL JONES from England did?
Can you make any number from 101 to 200 using four 4's and any operators?
TRIPLE FACTORIAL !!!
Take your number and subtract 3, then subtract 3 again and keep subtracting 3 until you get to 0 or less. Then multiply all the answers together to get the triple factorial. Therefore:

131 = (((4!!)!! + 4!)/4!!) + (4!!)!!!
= (((4x2)!! + 4x3x2x1)/(4x2)) + (4x2)!!!
= ((8!! + 24)/8) + 8!!!
= ((8x6x4x2 + 24)/8) + 8x5x2
= ((384 + 24)/8) + 80
= (408/8) + 80
= 51 + 80
= 131
155 = INT(SQRT((4!!)!))  INT(SQRT((4!!)!!)) 4! SQRT4
= INT(SQRT((4x2)!))  INT(SQRT((4x2)!!))  4x3x2x1  2
= INT(SQRT(8!))  INT(SQRT(8!!))  24  2
= INT(SQRT(8x7x6x5x4x3x2x1))  INT(SQRT(8x6x4x2))  26
= INT(SQRT(40320))  INT(SQRT(384))  26
= INT(200.798)  INT(19.596)  26
= 200  19  26
= 155
Admittedly they're not pretty, useful or even interesting, but you simply have to sit back and admire the sheer determination and brain power that produced the 101200 answers!