Can you please describe in detail what did you do to hide the New button on Custom Object Tab with the help of List view? 

STEP 1: Create a simple Visualforce page (this example uses the Bookings Object)

Your Name > Setup > App Setup > Develop > Pages

Select the New button.  Add a descriptive label (IE: Bookings Tab Homepage Override) and tab to auto-create a Name (which you can then shorten/customize).

Salesforce will automatically start you off with some default Visualforce Markup:

To replace the tab homepage with a list view, you will need to delete the default Markup and paste the following:

<apex:page showHeader="true" tabstyle="API Name">

<apex:sectionheader title="Plural Label" subtitle="Home"></apex:sectionheader>

    <apex:ListViews type="API Name" />

</apex:page>

• Tabstyle > defines which Tab is highlighted in the header when you are viewing this page
• Sectionheader Title & subtitle > Every tab homepage includes this information. The Subtitle always reads “Home” and will display larger than the Label
• ListViews Type > The standard list view that would be seen if someone hit “Go” on the homepage.  You can also utilize the <apex:enhancedList> option here for more control over attributes like height, rows per page, etc.

For the Booking Object (custom):

So the resulting Markup for this page is as follows:

<apex:page showHeader="true" tabstyle="lod4__Event__c">

<apex:sectionheader title="Bookings" subtitle="Home"></apex:sectionheader>

    <apex:ListViews type="lod4__Event__c" />

</apex:page>

Step 2: Override the Standard Page with your new Visualforce Page
Now that the new page is created, we need to tell Salesforce to display it when users click the Tab. From Your Name > Setup > App Setup > Create > Objects, select your object and the Standard Buttons and Links related list. Select Edit next to the Label (Object) Tab line item to open the Override Properties window.
By Default, the Override With will show No Override (use default), change this to Visualforce Page and select your page (as named in Step 1) from the picklist.

Save your changes. You will now see your page marked as Overridden:

Step 3: Modify the Buttons displayed on your new Page

This page format will re-create a list view the home Tab for your Object, but it will now include ListView buttons for New (Object) and Change Owner:

To hide these buttons, go to Your Name > Setup > App Setup > Create > Objects and select your custom object. Go to the Search Layouts Related List and select Edit next to the (Object) List Viewline item.

Now you have a new Tab Landing Page which does not offer any options for creating New Records!

Step 4: Grant users Access to your Page

The last step is to grant access to Users so they can see your lovely Visualforce page.

To accomplish this do the following:
Go to the Setup | Develop | Pages
You will see The Following:
 

Click on the Security link next to your page. It will take you to the Page Level Security Page.
 
Select the Profiles from the Left side and click the Add button to Enable them - Click save.
***Note: This gives the Access to this VF Page only, each VF Page is independent. So if you like to give access to more VF Pages then you must repeat the steps for that Page. ***

Awesome! This works. Thank you!