Well now you have a minature TARDIS all to yourself. Let's hope it really is bigger on the inside considering how small it is. If you want to improve the design you could add a switch to the circuit so you could turn off the LED and save the batteries life. If you want to get really advanced you could make the LED flash and have a speaker that played the TARDIS take off noise. Well either way hope you have fun with your new TARDIS.