Solution: The Eurozone
Answer: ADOBE

Written by Kenny Young and Dana Young

As clued by the phrases “mind-boggling” and “funny money”, the grid contains rhymes of each currency, laid out Boggle-style rather than in a straight line. As clued by the phrases “pronounced effect” and “M-W Com”, m-w.com is a good reference for pronunciations.

Each cell in the grid identifies:

WHIPPEACONECHESTWINGFLOSSRAPO
SUNHUTTMALPILLKEYBLUEKNOTSSLEIGH
BONEAAHMOUNDGUNNTREED’OHNUNCAR
CROWDISHCHRISCHEESEEARCANEKNEESEW
FLYSCREWBALLGRAYPHOSMITHBEANBAT
CANVINDUHBRATHORJACKCHOBENCH
BILLFISHSHARKHANKSPURBEAKBEETANK
FURCRUTCHWELLTONTEAZURGGUMDUCKS

The currencies can be found above as follows:

AUSTRIAN SCHILLINGFLOSS-KEY-GUNN PILL-WING
BELGIAN FRANCWELL-TON HANK
CROATIAN KUNAPO-SLEIGH-NUN BLUE-RA
CYPRIOT POUNDWHIP-PEA-HUTT MOUND
DUTCH GUILDERCRUTCH BILL-FUR
ESTONIAN KROONCHEST-CONE-PEA-SUN BONE
FINNISH MARKKAVIN-FISH SHARK-BRA
FRENCH FRANCBENCH TANK
GERMAN MARKSPUR-TON SHARK
GREEK DRACHMABEAK JACK-PHO
IRISH POUNDFLY-DISH MOUND
ITALIAN LIRAHUTT-MAL-GUNN EAR-PHO
LATVIAN LATSBAT-KNEE-NUN KNOTS
LITHUANIAN LITASSMITH-PHO-CANE-TREE-GUNN KEY-FLOSS
LUXEMBOURGIAN FRANCDUCKS-GUM-ZURG-TEA-TON HANK
MALTESE LIRABALL-CHEESE EAR-PHO
PORTUGUESE ESCUDOTHOR-PHO-CHEESE CHRIS-SCREW-CROW
SLOVAK KORUNACHO-JACK THOR-PHO-BRA
SLOVENIAN TOLARCHO-BEAN-KNEE-NUN SEW-CAR
SPANISH PESETACAN-FISH DUH-GRAY-PHO

Three pictures in the grid are unused for any of the currencies: AAH, D’OH, and BEE. Pronounced together, they make the answer ADOBE.