Mix Match panels

It is possible. They will need diodes to prevent one PV module from "bleeding" power onto the other but allow the power from each to "move on" through the PV source circuit.
Write down the open circuit voltage and the short circuit amprage from each of your modules. Take this to a electronics dealer/repair person in your area and explain to him what you are wanting to achieve. Be sure this person knows that PV modules get hot sitting perpendicular to the Sun.
In the mean time here is some informative reading material.
http://photovoltaics.sandia.gov/
Some more fun with PV.
http://www.udel.edu/igert/pvcdrom/index.html
And last but not least, a clue.
http://store.solar-electric.com/blocdiod8amp.html
From our gracious host we have - http://store.altenergystore.com/Enclosures-Electrical-and-Safety/Miscellaneous-Electrical-Parts/Blocking-Diodes/c513/
You will need two of course. One for each module. Be sure to match each diode you use to the PV modules rating that it is used on. Just dont under size it.
Are you any good at soldering? If not a terminal strip may work.