A great way to make coins is to create an item worth more than it costs to craft, then sell it for a profit. You can play puzzles or add  the required items to your wish list. Starting with the top most profitable items, the list is limited to crafts with a profit of at least 1200 coins, but includes all crafts thru level 106.

Note that none of these items can be gifted for less than they cost to craft. In fact, most cost 1000-5000 more to gift to a friend than to craft them. Also see the complete list of craft values. 

CRAFT PROFIT COIN
VALUE		 COIN
COST		 COINS
TO GIFT		 # OF
STAMPS		 LEVEL
Key to All Secrets 2200 2200 0 4540 5 88
Pendant of Island Ruler 2200 2200 0 320 13 90
Blessing Pendant 2040 2240 200 4480 20 12
Ancestor’s Spirit 2000 2000 0 4000 8 12
Bridger of Realms 2000 2000 0 4500 16 59
Seal of Prayer 2000 2700 700 5400 6 12
Thicket Keeper 2000 2000 0 5500 12 36
Warlock Pass 2000 2000 0 5850 18 68
Valeria’s Travel Diary 1800 1800 0 4540 5 79
Mechanical Heart 1780 2080 300 4160 12 12
Monster of the Dawn 1755 1755 0 3510 8 12
Devasted Wanderer 1750 1750 0 3510 8 89
Dead Town Guard 1700 1700 0 3420 15 89
Grim Cup 1650 1650 0 3360 8 90
Celestial Hunter 1430 1730 300 3460 4 12
Insomnia Horn 1300 1300 0 3970 26 35
Star of Renovation 1300 1300 0 5600 15 20
Chastening Power 1270 1770 500 3540 6 12
Sign of Ferocity 1240 1540 300 3080 7 12
Cube of Fortune 1200 1200 0 3310 12 12