res/drawable/tab_contacts.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2014 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License
  -->

<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="@color/tab_ripple_color">

    <item>
        <bitmap android:src="@drawable/ic_people_24dp"
            android:gravity="center" />
    </item>

    <item android:id="@android:id/mask">
        <color android:color="@android:color/white" />
    </item>

</ripple>