Yep,
Go to your nearest Maplins and buy
2x flashing LEDs - order code uk37 (red 5mm, there is different sizes and colour also).
2x 270 or 330 ohm resistors - order code M270R, M330R etc. (lower value - brighter. higher value - longer battery life)
a battery - order code MM22. (12V 1.3Ah, 97 x 43 x 52 mm).
a bag of wire.
Connect +ve of battery to leg of resistor, other leg of resistor to LONGER LEG of LED, and finally shorter leg of LED back to negative of battery.
Do this with both resistors/led (in parallel).