Organize a group of people together to feed the homeless that are in the street. There is such a homeless problem in California and not enough shelters to help all of the homeless. There are a few different people/groups of people I have witnessed that have made it their business to make hundreds of sandwiches a day and pass them out to the homeless. There was a lady in Los Angeles who would cook great healthy homemade soups and drive around to the different spots where she knew the homeless people would gather and she made sure they had something good to eat as regularly as possible. But sometimes people can't do that on such a grand scale and it still makes a big difference on a smaller scale sometimes. Just giving something to a homeless person - a warmed plate of your leftovers from dinner perhaps - is a great thing.
Walk up to a homeless woman who is minding her own business, not begging off of anybody, and give her 10% of your weekly income. I met a man one time who did that because he no longer attended church and it was his form of paying tithes. See how big that woman's smile gets. Depending on what you make, you might be able to divide that among 10 homeless women and still get great, surprised, thankful, almost wondrous expressions of happiness.
Volunteer to mentor or assist a homeless person who is not totally beyond help. There are plenty of homeless people out there who look beyond help. Homelessness is a battle of hopelessness. The longer a time a person remains homeless, the more hopeless they feel about everything. People who have been homeless for more than a year become "The Chronic Homeless" and their chances for being able to escape the confines of homelessnes are statistically decreased. Sometimes people just need an address for employment opportunities, a contact phone number for messages, encouragement, food, a safe place to store clothing and personal belongings. When homeless people don't have at least these meager advantages, it can be intensely difficult to make it back into a more normal type of living environment.
Become a mentor or a Big Brother.
Volunteer to tutor children or speak to children to motivate them to study well so they can become a graphic designer or whatever they want to achieve.
Donate some of your graphic design services or discount as a donation to help non-profit charities advertise events that can help them achieve their goals.
County hospitals often welcome volunteer administrative help.
(Just a few ideas - I could go on forever with this. So many worthy causes out there need volunteeristic people.)