i just saw Walmart had some regular blue colored bulbs by Xenon White Lightning that'll replace the factory clear bulbs. a pair for just under $5, but you need 5 bulbs if you want the needles and the back of the gauges to glow blue. not sure how bright they are tho :\

'98 ford contour gl 2.0L 4 cylinder manual, cabernet red mod(s): blue leds in instrument cluster, sony cdx-sw2000 cd player plan(s): air intake, exhaust, mesh grill, bright white lights, new shift and e-brake covers