Using custom services or liferay services in liferay themes (velocity templates)?

How to use custom services method in liferay themes in velocity files like init_custom.vm, portal_normal.vm etc.

I see liferay provides a lot of variables of helper utility classes like $portalUtil for PortalUtil, $getterUtil for GetterUtil and so on, inside the init.vm file.

So is it possible to get instance of my custom services like an instance of com.my.custom.service.MyCustomLocalServiceImpl or services of liferay from UserLocalServiceImpl?

Here is some psuedo code, to give an idea of what I need:

// this code calls method from MyCustomLocalServiceImpl class to fetch items
#set ($listOfItems = $myCustomLocalServiceUtil.getAllItems())

// this code calls method from UserLocalServiceImpl class to fetch users
#set ($listOfUsers = $userLocalServiceUtil.getUsers(0, 99))

Environment: Liferay 6.1 CE GA1

It is possible.

1. The following code shows how to get the services:

   // Fetching instance of my custom services
   #set ($myCustomLocalService = $serviceLocator.findService('myCustomServices-portlet', 'com.my.custom.service.MyCustomLocalService'))
   
   // Fetching instance of UserLocalServiceImpl
   #set ($userLocalService = $serviceLocator.findService('com.liferay.portal.service.UserLocalService'))
   

2. Then simply call the service methods:

   #set ($listOfItems = $myCustomLocalService.getAllItems())
   
   #set ($listOfUsers = $userLocalService.getUsers(0, 99))
   

_{For Liferay 6.1 CE GA1: I found this class VelocityVariablesImpl (see methods like insertHelperUtilities, insertVariables) which actually makes all the variables and helper utilities available to the velocity templates.}